Fuel-control mechanism for internal-combustion engines



1,684,126 E. L. coRMAN FUEL CONTROL MECHANISM FOR INTERNAL COI QUSTIONEQEINES Filed Now 20, 1926 Sept. 11, 1928.

8 Edward L. Carm ang akknmq Patented Sept. 11, 1928.

UNITED STATES EDWARD L. CORMAN, OF UPLAND, CALIFORNIA.

FUEL-CONTROL MECHANISM FOR INTERNAL-COMBUSTION ENGINES.

Application filed November 20, 1926. Serial No. 149,728.

This application relates to improvements in fuel control mechanism forinternal combustion engines and hasfor its primary object to provide anauxiliary control for the throttle valves of tractors and light engines.

A further object of the invention is the provision of a controlmechanism which will permit more accurate adjustment of'the fuel supplyvalve of an internal combustion engme. i j 1 A still further object ofthe invention is the provision of a mechanism of the above.

provision of a mechanism of the above type which is simple and durableof construction, efficient in use and which can be manufactured at acomparatively low cost.

Other objects and advantages of the invention will become apparent asthe description progresses. 1 I

In the accompanying drawing, forming a part of thisspecification, and inwhich like reference characters are employed to designate correspondingparts throughout the same:

Figure 1 is a front elevational view of a control mechanism constructedin accordance with my invention,

Figure 2 is a horizontal transverse sectional view taken on the'line 22of Figure 1 and Figure 3 is an end elevational view of the controlmechanism. 7

Referring to the drawing wherein for the purpose of illustration isshown the preferred embodiment of my invention, the numeral 10designates a fragmentary portion of a tractor instrument board uponwhich is securely fixed a suitable fuel valve control. At the presenttime, the throttle control of tractor engines, particularly upon a wellknown type of tractor, embodies a toothed quadrant plate secured to theinstrument board to which is operatively secured a control lever. Thecontrol lever is formed with a spring pressed trigger adapted to engagethe teeth of the quadrant to permit adjustment of the lever in anysuitable position. It has been found that this particular controlstructure is not sufficiently delicate and accurate as it is oftendesirable to secure a more delicate adjustment for the proper operationof the engine. With this in mind,

' pivot pin 24.

I have modified the standard construction of the control andsupplemented the same with an auxiliary adjusting mechanism whichwillprovide a more delicate and accurate adjustmentof the throttle.

Referring more particularly to the'structure embodied in ,my invention,the numeral 11 indicates an arcuate substantially quadrant shapedsupport arm bentat its upper end to provide a se curingvflange 12 whichis screwedror otherwisefastened to the instrument board 10, and likewisebent at its lower end to provide a flange 13. A straight supporting arm14 projects horizontally from the instrument board and at its outer endis connected with the fiang'e 13 of the quadrant arm 11. The inner endof thearm 14 is bent to provide an attaching flange 15 which is fastened.to the instrument board bymeans of screws or the like, While theotherend is bent at arightangle and carries an internally screw-threadedbearing collar 16. An intermediate spacing bar 17 is secured to theupper endlof the arm 11 and adjacent the inner end of the straightarm-14, this spacing bar being disposed in spaced relation to theinstrument board. The lower end of the spacing bar 17 is twisted at aright angular posit-ion and formed with horizontally projecting parallelbearing ears 18.

A quadrant plate 19 is mounted in vertical position against the curvedarm 11, the outer curved edge of this plate being arranged to formratchet teeth 20, extending in a substantially parallel position withthe outer edge of the curved arm. This quadrant plate is spaced from thearm and is formed adjacent its lower forward edge with an arcuate slot21. A pin 22 is secured to the curved arm to project through the slot soas to limit the movement of the plate. The lower inner edge of the plate19 is provided with a tapered downwardly extending finger 23, thisfinger being apertured at its upper and lower ends.

adapted to register with the openings formed 1 in the bearing ears 18. apivot pin 24 extending ithrough the openings to provide a pivot oin pThe throttle valve is normally controlled by movement of a taperedcontrol lever 25 the upper end being offset to provide a handle 26 whilethe lower end is formed with an apertured extension adapted to engagethe This lever is formed with a substantially right angular lever arm27, the

outer end of which is apertured to engage the inner end of the throttlelever 28. The outer free end of the lever is provided with a springpressed pin 29 which is normally urged into engagement with the ratchetteeth so as to maintain the lever securely in any set position.

My improved structure aims to provide means whereby the entire plate andlever may be adjusted to control a throttle valve, this being effectedby means of a circular screw-threaded rod 30 threadedly projectedthrough the horizontal collars 16' and horizontally movable therein.Secured to the outer end of the rod 80 is a hand wheel 31 adapted topermit convenient adjustment of the red. A. horizontal connecting bar 32is pivotally connected with the lower end of the finger 23, as at 33,while the outer end of the bar is bent at right angles to provide abearing' for the inner end of the'rod 30. The rod is projected throughthe bearing 3t and rotatably held in position thereon bym'eans ofcollars;

It will thus be apparent that by rotation of the hand wheel 31 the rod30 and bar 32 will be horizontally reeiprocated and impart swingingmovement to the finger 23 and plate 19;v $winging movement of the platewill cause a similar swinging movement of the lever 25 for operation ofthe throttle valve. The initial throttle control setting is obtained byadjustment of the lever 25 relativeto the plate 19; A more accurate andfiner adjustment maybe then had by opera" shape, size and arrangement ofparts may be resorted to without departing from the spirit of theinvention or the scope of the subjoined claim. I v

Having thus descrlb'ed my invention, I

claim A control mechanism for operating the throttle valve of internalcombustion. engines 7 comprising a support for attachment to instrumentboard, a plate pivotally mounted on the support for swingingm'ovemeiiha' control lever pivotally mounted upon the plate and havingan extension arm connected to the throttle extensionrod, the s'aidlever.

being adjustable independently of the plate and embodying locking meansfor engage ment therewith, and an auxiliary 'eontror mechanismoperatively connected with the plate and adjustable to swing the plat-snd control lever simultaneously to permit accurate adjustment of thethrottle valve.

In testimony whereof I aifix my signature.

EDWARD L. ooniuan

